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ROBERT FULTON BLAKE, 0F BOSTON, MASSA CHUS ETTS, ASSIGITOR TU SUBMARENE SIGNAL COMPEL'NY, 0F POB/TLAN'D, MAINE; A. CGPJBOEATION 0F MAINE.

TMIK-MG'UNTING.

Stabilisation ofteriers Patent.

Patented Aug, 3, $92G Application as February a, 1916. Serial No rams.

ful Improvement in Tank-Mountings, of

which the following is a specification;

In receiving submarine signals on board ship it has been the custom to attach a cast 2 iron tank to the'metallic frame or skin of the ship, which is usually made of ste'ehwith an intervening gasket to make the joint watertight, fill'the tank with salt water. or other liquid orisubstantiallythe same density andin "the liquid-the microphone or suspend other like instrument which is to receive the sound waves. 7 the sound wavesiint'o electric impulses and lating the tank from the ship,

The instrument 'transtorms transmits them' to the receiving telephone, and so used may be called a receiving microphone; Its connecting wires run to the receiving. telephone.

After-Such a tank has been in use for some time the ,mechanical watertight joint between-the tank,'the gasket and the supporting plate 'or' skin may become impaired, so thatthe joint leaks. Asthis may be due to the creeping of salts into the joint, this leakage can "befavoided by electrically'in'subut whenthis is done by insulating material of the usual type, 6., by hard rubber washers, it has been found that disturbing noises are transmitted from the sides andjfra-me of the ship into the tank, thereby producing false signals and interfering withthe reception of thetrue signals. It has finally been discovered that all the above difficulties ,could be overcome by using; spacers so constructed and so constituted as be insulators not "only-t0 electric impulsesf-but-"alsoto sound impulses,- and this constitlilte s; thesubj ect of n invention.

y inventionthereioreconsists, generally speaking in the use of both, sound and electrical spacers betweenfthe tank and the ships skin as well as between. itsineans of attachment and the "ships frame so that there ma be no pathior electrical current or sound vibrations between the tank and the ships frame I My invention vwill be understood by reference to the drawings, in which i Figure 1 is a vertical section of the side wall or skin of the ship andthe tank at- -tt;ached theretoinaccordance with my invenion. M

Fig, 2 being an enlarged sectional detail showing one form of the attaching meansphone D, which is hung within-the tank, a

with the least possible loss of energy. The microphone D is supportedwithin the. tank by means of wires (1 by which'it-is connected to the receiving telephone (not shown), The tank C ispreferably and usuallyjmade of cast iron an of. The cover a has an opening through it closed bya 'stopper c of rubber or other insulating material through-which the wires (Z pass. Thetank C may he ofany convenient shape. Usually it is square and is provided: with a- ';flange 0 about its edge, which is gro'oved'to receive the spacer t d has a hand hole G which is closed by a cover cbolted tothe rim there' This spacer is made of insulating material and is in fact preferably a piece of rubbertubing of suflicient thickness and weight to prevent contact betweenthe edge of the tank and the skin ofthe ship when the frames B by anuinber of bolts F of which two only are shown. In order to attach 'these'boltsto the frames, crossheams G are provided whichrun frbm one frame to the the-spacer Eand the skin Ato prevent any tank has been-"properly attached'thereto. -A rubber res aceustieai and electrical insulating means, '19 the edge of said tank resting upon tubular nieens being slightly iergey than the normal shape 0f said tubular means whereby Contact surfaces of said edge and said-tubular means willvary according 0 15 .iee pressure of the tank thereon.

ROBERT FULTON BLAKE 

